forked from OSchip/llvm-project
460 lines
15 KiB
C++
460 lines
15 KiB
C++
//===--- FormatToken.h - Format C++ code ------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file contains the declaration of the FormatToken, a wrapper
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/// around Token with additional information related to formatting.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_FORMAT_FORMAT_TOKEN_H
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#define LLVM_CLANG_FORMAT_FORMAT_TOKEN_H
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#include "clang/Basic/OperatorPrecedence.h"
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#include "clang/Format/Format.h"
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#include "clang/Lex/Lexer.h"
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#include "llvm/ADT/OwningPtr.h"
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namespace clang {
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namespace format {
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enum TokenType {
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TT_ArrayInitializerLSquare,
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TT_ArraySubscriptLSquare,
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TT_BinaryOperator,
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TT_BitFieldColon,
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TT_BlockComment,
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TT_CastRParen,
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TT_ConditionalExpr,
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TT_CtorInitializerColon,
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TT_CtorInitializerComma,
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TT_DesignatedInitializerPeriod,
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TT_DictLiteral,
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TT_ImplicitStringLiteral,
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TT_InlineASMColon,
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TT_InheritanceColon,
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TT_FunctionLBrace,
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TT_FunctionTypeLParen,
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TT_LambdaLSquare,
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TT_LineComment,
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TT_ObjCBlockLParen,
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TT_ObjCDecl,
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TT_ObjCForIn,
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TT_ObjCMethodExpr,
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TT_ObjCMethodSpecifier,
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TT_ObjCProperty,
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TT_ObjCSelectorName,
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TT_OverloadedOperator,
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TT_OverloadedOperatorLParen,
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TT_PointerOrReference,
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TT_PureVirtualSpecifier,
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TT_RangeBasedForLoopColon,
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TT_StartOfName,
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TT_TemplateCloser,
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TT_TemplateOpener,
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TT_TrailingAnnotation,
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TT_TrailingReturnArrow,
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TT_TrailingUnaryOperator,
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TT_UnaryOperator,
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TT_Unknown
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};
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// Represents what type of block a set of braces open.
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enum BraceBlockKind {
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BK_Unknown,
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BK_Block,
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BK_BracedInit
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};
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// The packing kind of a function's parameters.
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enum ParameterPackingKind {
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PPK_BinPacked,
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PPK_OnePerLine,
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PPK_Inconclusive
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};
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enum FormatDecision {
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FD_Unformatted,
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FD_Continue,
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FD_Break
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};
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class TokenRole;
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class AnnotatedLine;
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/// \brief A wrapper around a \c Token storing information about the
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/// whitespace characters preceding it.
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struct FormatToken {
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FormatToken()
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: NewlinesBefore(0), HasUnescapedNewline(false), LastNewlineOffset(0),
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ColumnWidth(0), LastLineColumnWidth(0), IsMultiline(false),
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IsFirst(false), MustBreakBefore(false), IsUnterminatedLiteral(false),
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BlockKind(BK_Unknown), Type(TT_Unknown), SpacesRequiredBefore(0),
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CanBreakBefore(false), ClosesTemplateDeclaration(false),
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ParameterCount(0), PackingKind(PPK_Inconclusive), TotalLength(0),
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UnbreakableTailLength(0), BindingStrength(0), NestingLevel(0),
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SplitPenalty(0), LongestObjCSelectorName(0), FakeRParens(0),
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StartsBinaryExpression(false), EndsBinaryExpression(false),
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LastInChainOfCalls(false), PartOfMultiVariableDeclStmt(false),
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MatchingParen(NULL), Previous(NULL), Next(NULL),
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Decision(FD_Unformatted), Finalized(false) {}
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/// \brief The \c Token.
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Token Tok;
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/// \brief The number of newlines immediately before the \c Token.
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///
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/// This can be used to determine what the user wrote in the original code
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/// and thereby e.g. leave an empty line between two function definitions.
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unsigned NewlinesBefore;
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/// \brief Whether there is at least one unescaped newline before the \c
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/// Token.
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bool HasUnescapedNewline;
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/// \brief The range of the whitespace immediately preceding the \c Token.
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SourceRange WhitespaceRange;
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/// \brief The offset just past the last '\n' in this token's leading
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/// whitespace (relative to \c WhiteSpaceStart). 0 if there is no '\n'.
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unsigned LastNewlineOffset;
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/// \brief The width of the non-whitespace parts of the token (or its first
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/// line for multi-line tokens) in columns.
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/// We need this to correctly measure number of columns a token spans.
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unsigned ColumnWidth;
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/// \brief Contains the width in columns of the last line of a multi-line
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/// token.
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unsigned LastLineColumnWidth;
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/// \brief Whether the token text contains newlines (escaped or not).
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bool IsMultiline;
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/// \brief Indicates that this is the first token.
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bool IsFirst;
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/// \brief Whether there must be a line break before this token.
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///
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/// This happens for example when a preprocessor directive ended directly
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/// before the token.
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bool MustBreakBefore;
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/// \brief Returns actual token start location without leading escaped
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/// newlines and whitespace.
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///
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/// This can be different to Tok.getLocation(), which includes leading escaped
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/// newlines.
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SourceLocation getStartOfNonWhitespace() const {
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return WhitespaceRange.getEnd();
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}
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/// \brief The raw text of the token.
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///
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/// Contains the raw token text without leading whitespace and without leading
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/// escaped newlines.
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StringRef TokenText;
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/// \brief Set to \c true if this token is an unterminated literal.
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bool IsUnterminatedLiteral;
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/// \brief Contains the kind of block if this token is a brace.
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BraceBlockKind BlockKind;
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TokenType Type;
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/// \brief The number of spaces that should be inserted before this token.
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unsigned SpacesRequiredBefore;
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/// \brief \c true if it is allowed to break before this token.
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bool CanBreakBefore;
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bool ClosesTemplateDeclaration;
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/// \brief Number of parameters, if this is "(", "[" or "<".
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///
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/// This is initialized to 1 as we don't need to distinguish functions with
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/// 0 parameters from functions with 1 parameter. Thus, we can simply count
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/// the number of commas.
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unsigned ParameterCount;
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/// \brief A token can have a special role that can carry extra information
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/// about the token's formatting.
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llvm::OwningPtr<TokenRole> Role;
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/// \brief If this is an opening parenthesis, how are the parameters packed?
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ParameterPackingKind PackingKind;
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/// \brief The total length of the unwrapped line up to and including this
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/// token.
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unsigned TotalLength;
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/// \brief The original 0-based column of this token, including expanded tabs.
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/// The configured TabWidth is used as tab width.
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unsigned OriginalColumn;
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/// \brief The length of following tokens until the next natural split point,
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/// or the next token that can be broken.
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unsigned UnbreakableTailLength;
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// FIXME: Come up with a 'cleaner' concept.
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/// \brief The binding strength of a token. This is a combined value of
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/// operator precedence, parenthesis nesting, etc.
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unsigned BindingStrength;
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/// \brief The nesting level of this token, i.e. the number of surrounding (),
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/// [], {} or <>.
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unsigned NestingLevel;
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/// \brief Penalty for inserting a line break before this token.
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unsigned SplitPenalty;
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/// \brief If this is the first ObjC selector name in an ObjC method
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/// definition or call, this contains the length of the longest name.
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unsigned LongestObjCSelectorName;
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/// \brief Stores the number of required fake parentheses and the
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/// corresponding operator precedence.
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///
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/// If multiple fake parentheses start at a token, this vector stores them in
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/// reverse order, i.e. inner fake parenthesis first.
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SmallVector<prec::Level, 4> FakeLParens;
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/// \brief Insert this many fake ) after this token for correct indentation.
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unsigned FakeRParens;
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/// \brief \c true if this token starts a binary expression, i.e. has at least
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/// one fake l_paren with a precedence greater than prec::Unknown.
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bool StartsBinaryExpression;
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/// \brief \c true if this token ends a binary expression.
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bool EndsBinaryExpression;
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/// \brief Is this the last "." or "->" in a builder-type call?
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bool LastInChainOfCalls;
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/// \brief Is this token part of a \c DeclStmt defining multiple variables?
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///
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/// Only set if \c Type == \c TT_StartOfName.
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bool PartOfMultiVariableDeclStmt;
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bool is(tok::TokenKind Kind) const { return Tok.is(Kind); }
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bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const {
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return is(K1) || is(K2);
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}
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bool isOneOf(tok::TokenKind K1, tok::TokenKind K2, tok::TokenKind K3) const {
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return is(K1) || is(K2) || is(K3);
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}
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bool isOneOf(tok::TokenKind K1, tok::TokenKind K2, tok::TokenKind K3,
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tok::TokenKind K4, tok::TokenKind K5 = tok::NUM_TOKENS,
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tok::TokenKind K6 = tok::NUM_TOKENS,
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tok::TokenKind K7 = tok::NUM_TOKENS,
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tok::TokenKind K8 = tok::NUM_TOKENS,
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tok::TokenKind K9 = tok::NUM_TOKENS,
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tok::TokenKind K10 = tok::NUM_TOKENS,
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tok::TokenKind K11 = tok::NUM_TOKENS,
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tok::TokenKind K12 = tok::NUM_TOKENS) const {
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return is(K1) || is(K2) || is(K3) || is(K4) || is(K5) || is(K6) || is(K7) ||
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is(K8) || is(K9) || is(K10) || is(K11) || is(K12);
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}
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bool isNot(tok::TokenKind Kind) const { return Tok.isNot(Kind); }
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bool isStringLiteral() const { return tok::isStringLiteral(Tok.getKind()); }
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bool isObjCAtKeyword(tok::ObjCKeywordKind Kind) const {
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return Tok.isObjCAtKeyword(Kind);
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}
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bool isAccessSpecifier(bool ColonRequired = true) const {
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return isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private) &&
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(!ColonRequired || (Next && Next->is(tok::colon)));
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}
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bool isObjCAccessSpecifier() const {
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return is(tok::at) && Next && (Next->isObjCAtKeyword(tok::objc_public) ||
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Next->isObjCAtKeyword(tok::objc_protected) ||
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Next->isObjCAtKeyword(tok::objc_package) ||
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Next->isObjCAtKeyword(tok::objc_private));
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}
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/// \brief Returns whether \p Tok is ([{ or a template opening <.
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bool opensScope() const {
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return isOneOf(tok::l_paren, tok::l_brace, tok::l_square) ||
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Type == TT_TemplateOpener;
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}
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/// \brief Returns whether \p Tok is )]} or a template closing >.
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bool closesScope() const {
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return isOneOf(tok::r_paren, tok::r_brace, tok::r_square) ||
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Type == TT_TemplateCloser;
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}
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/// \brief Returns \c true if this is a "." or "->" accessing a member.
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bool isMemberAccess() const {
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return isOneOf(tok::arrow, tok::period) &&
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Type != TT_DesignatedInitializerPeriod;
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}
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bool isUnaryOperator() const {
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switch (Tok.getKind()) {
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case tok::plus:
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case tok::plusplus:
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case tok::minus:
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case tok::minusminus:
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case tok::exclaim:
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case tok::tilde:
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case tok::kw_sizeof:
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case tok::kw_alignof:
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return true;
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default:
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return false;
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}
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}
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bool isBinaryOperator() const {
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// Comma is a binary operator, but does not behave as such wrt. formatting.
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return getPrecedence() > prec::Comma;
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}
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bool isTrailingComment() const {
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return is(tok::comment) && (!Next || Next->NewlinesBefore > 0);
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}
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prec::Level getPrecedence() const {
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return getBinOpPrecedence(Tok.getKind(), true, true);
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}
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/// \brief Returns the previous token ignoring comments.
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FormatToken *getPreviousNonComment() const {
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FormatToken *Tok = Previous;
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while (Tok != NULL && Tok->is(tok::comment))
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Tok = Tok->Previous;
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return Tok;
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}
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/// \brief Returns the next token ignoring comments.
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const FormatToken *getNextNonComment() const {
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const FormatToken *Tok = Next;
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while (Tok != NULL && Tok->is(tok::comment))
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Tok = Tok->Next;
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return Tok;
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}
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/// \brief Returns \c true if this tokens starts a block-type list, i.e. a
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/// list that should be indented with a block indent.
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bool opensBlockTypeList(const FormatStyle &Style) const {
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return Type == TT_ArrayInitializerLSquare ||
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(is(tok::l_brace) &&
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(BlockKind == BK_Block || Type == TT_DictLiteral ||
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!Style.Cpp11BracedListStyle));
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}
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/// \brief Same as opensBlockTypeList, but for the closing token.
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bool closesBlockTypeList(const FormatStyle &Style) const {
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return MatchingParen && MatchingParen->opensBlockTypeList(Style);
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}
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FormatToken *MatchingParen;
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FormatToken *Previous;
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FormatToken *Next;
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SmallVector<AnnotatedLine *, 1> Children;
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/// \brief Stores the formatting decision for the token once it was made.
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FormatDecision Decision;
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/// \brief If \c true, this token has been fully formatted (indented and
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/// potentially re-formatted inside), and we do not allow further formatting
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/// changes.
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bool Finalized;
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private:
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// Disallow copying.
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FormatToken(const FormatToken &) LLVM_DELETED_FUNCTION;
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void operator=(const FormatToken &) LLVM_DELETED_FUNCTION;
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};
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class ContinuationIndenter;
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struct LineState;
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class TokenRole {
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public:
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TokenRole(const FormatStyle &Style) : Style(Style) {}
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virtual ~TokenRole();
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/// \brief After the \c TokenAnnotator has finished annotating all the tokens,
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/// this function precomputes required information for formatting.
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virtual void precomputeFormattingInfos(const FormatToken *Token);
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/// \brief Apply the special formatting that the given role demands.
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///
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/// Continues formatting from \p State leaving indentation to \p Indenter and
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/// returns the total penalty that this formatting incurs.
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virtual unsigned format(LineState &State, ContinuationIndenter *Indenter,
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bool DryRun) {
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return 0;
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}
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/// \brief Notifies the \c Role that a comma was found.
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virtual void CommaFound(const FormatToken *Token) {}
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protected:
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const FormatStyle &Style;
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};
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class CommaSeparatedList : public TokenRole {
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public:
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CommaSeparatedList(const FormatStyle &Style) : TokenRole(Style) {}
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virtual void precomputeFormattingInfos(const FormatToken *Token);
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virtual unsigned format(LineState &State, ContinuationIndenter *Indenter,
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bool DryRun);
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/// \brief Adds \p Token as the next comma to the \c CommaSeparated list.
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virtual void CommaFound(const FormatToken *Token) { Commas.push_back(Token); }
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private:
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/// \brief A struct that holds information on how to format a given list with
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/// a specific number of columns.
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struct ColumnFormat {
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/// \brief The number of columns to use.
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unsigned Columns;
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/// \brief The total width in characters.
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unsigned TotalWidth;
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/// \brief The number of lines required for this format.
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unsigned LineCount;
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/// \brief The size of each column in characters.
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SmallVector<unsigned, 8> ColumnSizes;
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};
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/// \brief Calculate which \c ColumnFormat fits best into
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/// \p RemainingCharacters.
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const ColumnFormat *getColumnFormat(unsigned RemainingCharacters) const;
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/// \brief The ordered \c FormatTokens making up the commas of this list.
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SmallVector<const FormatToken *, 8> Commas;
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/// \brief The length of each of the list's items in characters including the
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/// trailing comma.
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SmallVector<unsigned, 8> ItemLengths;
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/// \brief Precomputed formats that can be used for this list.
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SmallVector<ColumnFormat, 4> Formats;
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};
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} // namespace format
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} // namespace clang
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#endif // LLVM_CLANG_FORMAT_FORMAT_TOKEN_H
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